Faint Horizontal lines on top 1/4 of television screen

CORRECTION: model number JSJ12220

Sorry for the mistake.

Jon

Bad boost capacitor in the vertical circuit. The vertical output will fail soon if not fixed - it's presently running too hot.

Mark Z.

Thanks Mark. Any idea which capacitor it is? I don't have a schematic for the unit.

Jon

look at the caps near anything hot or burnd spots, my tv did this 2

for

fail

Lots are in the range of 100uF at 35 volts, near the vertical output. This is all just generic advice, BTW - don't know your model.

Mark Z.

...but your advice will be dead on correct. :-)

Tom

"Jon Danniken" bravely wrote to "All" (07 Oct 05 19:14:05) --- on the heady topic of "Re: Faint Horizontal lines on top 1/4 of television = screen (model corre"

Replace *all* electros around a 1" vicinity of the vertical IC. Cost of the electros is minimal and one might not have to go back in there for longer a while than if we just replaced the faulty one. Consider that commonly it takes more time to take things apart than to actually make a repair.

A*s*i*m*o*v

JD> From: "Jon Danniken" JD> Xref: core-easynews sci.electronics.repair:344431

JD> Thanks Mark. Any idea which capacitor it is? I don't have a JD> schematic for the unit.

JD> Jon

... If all else fails, hurl it across the room a few times!

It's a good idea to change all the electrolytic caps in the vertical deflection.

I.

Thank you Mark, and others. I located my Vertical IC (don't laugh), a uPC1378 variant, as well as five different electrolytics in the section. One of these is actually a 100uF at 35 volts, just as you predicted.

Am I going to want to special order a "low ESR" cap for a replacement? My local parts store only carries "regular" caps; otherwise I'll have to go through digikey.

Thanks again, and I apologize for the delayed response to this.

Jon

Get the 105 degrees C version at least. Low ESR likely isn't important.

Tom

This

My

Thanks, Tom. I ended up ordering the batch through digikey, low ESR 105C jobs, since they were about as cheap as the other ones anyway. The only outlet in town had the same old dried up electrolytics they've had for the last 10 years, and the TV repair place wanted $7.20 for just *one* cap (I guess that's their way of saying they don't want to sell me caps, lol).

Jon